Change logic of choosing depot for collection log
Change logic of choosing depot for collection log

If log collection is requested in Zone - zone's depot is taken
If log collection is requested in MiqServer -  MiqServer's depot is taken
In both cases if there is no Zone(MiqServer)'s depot defined - it fails.
(transferred from ManageIQ/manageiq@2094f59b7ba1eb2a77205d9ea76ce78a8b325d3d)

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic